<script type="module">
	{
		let obj = {};
		let a = Symbol('a');
		let b = Symbol.for('b');
		
		obj[a] = 'Hello';
		obj[b] = 'World';
		    
		document.write(`返回 Symbol数组：${ Object.getOwnPropertySymbols(obj)}<br><br>`);
	}
</script>